How to check leveling of printer bed ? What should be ideal values on x,y and z to ensure printer bed is flat and there is no angle between plane of nozzle and plane of printer bed ?
The CubePro printer appears to have a comprehensive leveling system built into the menu. The direct instructions for this process can be found here: CubePro Calibration
I would suggest that "ideal values" are those created by the calibration process that confirms the necessary settings for a good print.